js实现幻灯片轮播原理

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本篇文章具体介绍如下

<!DOCTYPE html PUBLIC "-//W3C//DTD hTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<script type="text/javascript">
	var timeID;
	var image;
	var current = 0;
	var images = new Array(5);
	function init(){
		for (var i=1;i<=5;i  ){
			images[i] = new Image(450,550);
			images[i].src = "pictures/" i ".jpg";
		}
		image = document.images[0];
	}
	function setSrc(i){
		current = i;
		//设置图片src的属性，实现图片的切换
		image.src = images[i].src;
	}
	function pre(){
		if (current <= 0){
			alert('已经是第一张了');
		}else{
			current--;
			setSrc(current);
		}
	}
	function next(){
		if (current >= 5){
			alert('已经是最后一张了');
		}else{
			current  ;
			setSrc(current);
		}
	}
	function play(){
		if (current >= 5){
			current = 0;
		}
		setSrc(  current);
	}
</script>
<body onl oad="init()">
<input type="button" value="第一张" onclick="setSrc(1)">
<input type="button" value="上一张" onclick="pre()">
<input type="button" value="下一张" onclick="next()">
<input type="button" value="最后一张" onclick="setSrc(5)">
<input type="button" value="幻灯播放" onclick="timeID=setInterval('play()',500)">
<input type="button" value="停止播放" onclick="clearInterval(timeID)">
<div style="border:1px solid blue;width:450px; height:550px;" id="myPic">
	<img src="pictures/1.jpg" />
</div>
</body>
</html>

首先init()函数用于初始化images数组和image的值，本例中主要是利用setSrc()设置图片的src属性值，